Air-pump



G. A. MORTIER.

AIR PUMP.

APPLICATION FILED FEB. 16. I920.

1,3 3, 9 Patented Dec. 28,1920.

4 SHEETS-SHEET I.

' G. A. MORTIER.

AIR PUMP.

APPLICATION FILED FEB. 16. 1920.

1 ,363,898 I Patented Dec. 28, 1920.

4 SHEETS-SHEET 2.

G. A. MORTIER.

AIR PUMP.

APPLICATION FILED FEB. 16. 1920.

1,363,898. 7 Patented 'Dec. 28, 1920.

4 SHEETS-SHEET 3.

G, A. MORTIER.

AIR PUMP.

APPLICATION FILED FEB. I6 1920.

1,363,898. Patented Dec. 28,1920.

4 SHEETS-SHEET 4.

UNITED STATES GEORGES ALBERT MORTIER, OF BURNLEY, ENGLAND.

AIR-PUMP.

Specification of Letters Patent.

Patented Dec. 28, 1920.

Application filed February 16, 1920. Serial No. 359,067.

r T 0 all whom it may concern Be it known that I, GEORGES ALBERTMOR- TIER, a subject of the King of Belgium, residing at Burnley, in the county of Lancaster, England, have invented certain new and useful Improvements in Air-Pumps, of which the following is a specification.

This invention relates to air pumps adapted to be operated by hand or foot pressure, and is especially applicable to such pumps as are used for inflating pneumatic tires. The object of the said invention is to produce a pump of the collapsing triangle type wherein the piston is constrained to move correctly in relation to the axial line of the cylinder or pump barrel, and the latter is so mounted that on the expulsion stroke it advances to meet the piston, thus obtaining a greater effective pumping action for a given stroke of the operating lever.

A pump according to my invention comprises a base to which is pivoted a duplex lever, the two arms of which are joined by a pin or crossbar to which is pivoted or connected the free end of the piston rod, the portions of the crossbar adjacent to the arms of the lever working in slots or guides, which may be formed by an open cylindrical extension of the pump barrel, and provide stops limiting the stroke of the piston. The pump barrel is eccentrically pivoted or movably mounted at a position below its axial line, such pivots or other mountings being preferably at a level below that reached by the bottom of the oscillating pump barrel at the lowest part of its oscillation. For example, the pivots or trunnions on which the pump barrel oscillates may be located at each side of the base at points tangential to the circumference of the pump barrel; or the pump barrel may be provided with eccentric semi-pinions engaging racks on the base; or the end of the pump barrel may be pivoted to a pin adapted to slide in slots in the base, a draw bar being so connected to the barrel and base as to draw forward the barrel during the expulsion stroke, and to return it during the induction or upward stroke. On the said upward stroke the operating lever is in all cases actuated automatically by a spring or springs, for example a spring confined between the lever and base, or a spring surrounding the hinge pin of the lever.

In order that my invention may be clearly understood, I will now describe exemplifications thereof with reference to the accompanying drawings, wherein F igure 1 is a side elevation of the simplest form of the pump ready for use. Fig. 2 shows the same with the operatmg lever partly depressed, and Fig. 3 shows the same at the period of completion of the expulsion stroke.

Fig. 4 is a view taken in the direction of the arrow IV in Fig. 1.

Fig. 5 is a rear elevation corresponding with Fig. 3.

Fig. 6 represents in perspective a modification in the slotted guides.

F1gs. 7 and 8 illustrate modifications wherein the pump barrel is movably mounted.

Referring firstly to Figs. 1 to 5, the reference numerals 1 and 2 indicate the side rails of the base, secured together by cross stays 3 and 4t and inclosing hinge pins 5 and 6. On the hinge pin 5 work two straight lever arms 7 and 8 supporting a pedal or pressure plate 9. The arms 7 and 8 have also a fixed cross stay 10 and a pin or cross bar 11. On the pump barrel 12 are lugs 14: and 15 pivotally engaging the pin 6, and in a forward extension of this barrel are slots 16 in which the rounded portions of the crossbar 11 can move without undue friction; the piston rod 17 is pivotally connected to this crossbar 11. A flexible air pipe can be attached at 18. A spring 19 surrounds the hinge pin 5, its two ends engaging the stay 3 and a central project ing portion engaging the stay 10. On applying pressure in the direction of the arrow 20 to the plate 9, the crossbar 11 is caused to travel in the slots 16, advancing the piston in the pump barrel, and at the same time the barrel in its descent comes forward to meet the piston, until the position of the parts shown in Fig. 3 is reached, a compound leverage being thus exerted. The plate 9 being then released from pressure, the spring 19 acting on the operating lever through the cross stay 10 thereon causes the return of all the parts to the positions shown in Fig. 1. v

Referring to Fig. 6, the guides 21 may be substituted for the slotted extension of the pump barrel.

Referring to Fig. 7 the pin G is located in a slot 22 in the base, and a bar or rod 23 is pivoted to the base and to the front of the pump barrel extension. A similar slot and bar will of course be provided at the opposite side of the device. As the pump barrel is lowered the front of the bar 23 travels in the curve shown dotted, and draws forward the pump barrel, the pin 6 traveling forward in the slot. hen after the completion of the expulsion stroke the spring 19 returns the lever and the pump barrel is raised, the action of the bar 23 is reversed so that the pin 6 goes back.

Referring to Fig. 8, the lug 14 and the corresponding lug at the opposite side of the pump barrel are provided with teeth engaging racks formed on the base. The pin 6 passes through a saddle 24 which is capable of a slight longitudinal reciprocatory movement in relation to the base. The lowering and raising of the pump barrel as aforesaid thus cause it to advance and re turn. The saddle works in grooves in or guides on the base.

In an air pump, a base, a cylinder pivoted at one end to one end portion of the base and provided with longitudinally slotted guides, a piston working in the cylinder and provided with a piston-rod, two operating levers pivoted to the other end portion of the base, a bar slidable in the said guides and operatively connecting the middle parts of the said levers with the piston-rod, means for permitting the cylinder to slide longitudinally of the base, and a bar pivoted between the front end portion of the cylinder and the middle part of the base and constraining the cylinder to slide toward the pivot of the said operating levers when they are depressed.

In testimony whereof I affix my signature.

GEORGES ALBERT MORTIER. 

